Sturdy Material : This Rierdge Self-Locking Shelf Pins made of high quality thicken plastic. Hidden and durable! Self-locking design, come with strong grip and easy to install; Stable triangular structure provides nice support, ensuring greater bearing capacity. Meet your requirement for both good-looking and last-using.Fit for 20mm thick shelf : Our products are industrial products and are subject to slight errors. The shelf holders only fits 3/4 inch (20 mm) thick boards with an outside diameter of 0.19 inches (5 mm) (measured from the ridge), note: the drilled holes should be slightly smaller than its diameter (about 11/64 inches). Please accurately measure the size of the drilled holes as well as the thickness of the boards before ordering the product to avoid subsequent errors in sizing that could cause problems in your shopping experience. For more detailed sizing information, please refer to the images. Easy to Install : No screws required for installation. The clear furniture shelf supporter are very easy to install by hand, just push support pegs in the drilled hole. Press the spring clip with your thumb, and the shelf can be removed easily. Smooth surface, comfortable and never hurt your hand. Wide Application : Ideal for medicine cabinet, kitchen cabinet, furniture, wardrobe, closet, cupboard, bookcase, pantry shelving, etc. The 20-piece ultra-luxury suit can be easily dealt with whether it is used for a variety of furniture or reserved for backup. Not only is it cost-effective, it can be used for a long time with one purchase! Package Content : Package contains 20 pcs Self-Locking Shelf Pegs. Sufficient quantity can meet your daily use needs.